A performance model for openMP memory bound applications in multisocket systems

César Allande, Josep Jorba, Anna Sikora, Eduardo César

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The performance of OpenMP applications executed in multisocket multicore processors can be limited by the memory interface. In a multisocket environment, each multicore processor can present a performance degradation in memory-bound parallel regions when sharing the same Last Level Cache (LLC). We propose a characterization of the performance of parallel regions to estimate cache misses and execution time. This model is used to select the number of threads and affinity distribution for each parallel region. The model is applied for SP and MG benchmarks from the NAS Parallel Benchmark Suite using different workloads on two different multicore, multisocket systems. The results shown that the estimation preserves the behavior shown in measured executions for the affinity configurations evaluated. Estimated execution time is used to select a set of configurations in order to minimize the impact of memory contention, achieving significant improvements compared with a default configuration using all threads.

Idioma originalEnglish
Títol de la publicacióIEEE International conference on computational science 2014 (ICCS 2014)
Lloc de publicacióCairns (AU)
Nombre de pàgines11
Estat de la publicacióPublicada - 1 de maig 2014

Sèrie de publicacions

NomProcedia Computer Science
ISSN (imprès)1877-0509


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